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Unnamed Occurrence (ARDF - GU045; in the headwaters of an east fork of Ahtell Creek), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
62° 52' 22'' North , 144° 0' 43'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mentasta Lake | 112 (2011) | 13.4km |
| Slana | 147 (2011) | 18.6km |
Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.
Location: The occurrence is at an elevation of about 4,800 feet on the northeast- facing slope of a ridge more than 6,000 foot high that separates two unnamed forks of upper Ahtell Creek. It is in the SW1/4SW1/4, section 25, T. 13 N., R. 7 E., Copper River Meridian. It is a generalized occurrence accurate to within 1,000 feet that includes several mineralized outcrops.
Geology: The occurrence is in the Jurassic 'tectonic, diorite to quartz diorite complex' of Richter that underlies the eastern part of the Ahtell Creek area (Richter, 1966; Richter and Matson, 1968; Richter, Lanphere, and Matson, 1975). It was discovered in 1979 following up a 1978 stream sediment survey of the area for the Ahtna Native corporation (WGM Inc., 1979). It is within a several-mile-long, gold-bearing trend aligned northwest that was called area 1 by WGM Inc. WGM found six streams in the belt with gold values from 200 to 850 ppb gold. During the follow up at this location, WGM Inc.(1980) identified a 50-foot- wide silica-carbonate-altered diorite that contained 205 ppb gold. Up hill from the diorite, a 2-foot-thick hanging wall of a quartz-pyrite vein contained 335 ppb gold. A float cobble of magnetite from the same area contained 3,260 ppb gold (0.095 ounce of gold per ton). It is not known if further work has been done in the area.
Workings: Stream sediments collected by WGM in 1978 were followed up in 1979 by outcrop sampling.
Age: Possibly related to a Jurassic diorite complex.
Alteration: Extensive silica-carbonate alteration of dioritic rocks.
Commodities (Major) - Au
Development Status: None
Deposit Model: Porphyry Au?
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
4 valid minerals.
Detailed Mineral List:
| ⓘ Gold Formula: Au |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | GU045 |
|---|
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